Not really robbery but got caught cheating at cards...

...was playing against an 82 year old for £150 each and I won 5 hands of cards at £30 each, so for a joke as I was cheating I said I'd bet £90 against his dentures if he took the bet...which he did!
Unfortunatley people could see what I was doing to stopped me from cheating and he won the £90 back...then had another bet and won another £90, so he got all his money back and £30 of mine...